EP0019348A1 - Drei-Zustands-Kodierungsschaltung für ein elektronisches Musikinstrument - Google Patents

Drei-Zustands-Kodierungsschaltung für ein elektronisches Musikinstrument Download PDF

Info

Publication number
EP0019348A1
EP0019348A1 EP80300437A EP80300437A EP0019348A1 EP 0019348 A1 EP0019348 A1 EP 0019348A1 EP 80300437 A EP80300437 A EP 80300437A EP 80300437 A EP80300437 A EP 80300437A EP 0019348 A1 EP0019348 A1 EP 0019348A1
Authority
EP
European Patent Office
Prior art keywords
signal
tri
control
further characterized
duty cycle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP80300437A
Other languages
English (en)
French (fr)
Inventor
William Robert Hoskinson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wurlitzer Co
Original Assignee
Wurlitzer Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wurlitzer Co filed Critical Wurlitzer Co
Publication of EP0019348A1 publication Critical patent/EP0019348A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/15—Arrangements in which pulses are delivered at different times at several outputs, i.e. pulse distributors
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/02—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos
    • G10H1/04—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos by additional modulation
    • G10H1/053—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos by additional modulation during execution only
    • G10H1/057—Means for controlling the tone frequencies, e.g. attack or decay; Means for producing special musical effects, e.g. vibratos or glissandos by additional modulation during execution only by envelope-forming circuits
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/18—Selecting circuits
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H7/00—Instruments in which the tones are synthesised from a data store, e.g. computer organs
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/18—Modifications for indicating state of switch
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S84/00—Music
    • Y10S84/10—Feedback
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S84/00—Music
    • Y10S84/23—Electronic gates for tones

Definitions

  • This invention is directed generally to encoding circuits and more particularly to a tri-state encoding circuit for an electronic musical instrument.
  • tri-level or "tri-state” sensing or encoding circuits have been proposed in the prior art for various functions. Basically, such a circuit is useful in developing a signal which may be transmitted over a single line, and yet contain sufficient information to derive three distinguishable signals.
  • each key may have one of three possible positions or states: unplayed or "up”, played or “down”, and in “transition” or between the "up” and “down” positions.
  • a percussion-type voice from such an instrument e.g., a piano voice
  • a signal having three states, corresponding to the three possible positions or states of a key-actuated switch may readily be utilized to develop a signal indicative of intensity of actuation of the associated key.
  • the signal may be utilized to turn on and turn off various clocks, counters or the like.
  • Such a system is shown, for example, in Wheelwright et al U.S. Patent 4,067,253.
  • the ability to develop such a tri-state signal using but a single line from the associated key-operated switch to internal musical instrument circuits results in great savings, as the number of lines required to be physically wired into the keyboard are reduced by one- half.
  • conventional practice would call for a separate wire from the keyboard of the instrument for each fixed contact of each key switch, thereby requiring at least two wires per switch.
  • suitable encoding circuitry only a single wire from the movable contact of each key switch need be utilized.
  • the present invention provides a novel and improved tri-state encoder circuit for this purpose.
  • the circuit of the present invention utilizes signal sources already available in the electronic musical instrument and further utilizes but a minimum of components to develop the suitable encoded signals.
  • the components utilized in the present invention are of a type which may be readily realized as a part of a large scale integrated circuit. Consequently, a tri-state encoder circuit according to this invention may be provided for each of the keys of a keyboard-type musical instrument, for example, on but a single integrated circuit chip.
  • a related object is to provide a tri-state encoding circuit which utilizes signals readily available in the electronic musical.instrument for its operation.
  • Another object is to provide a tri-state encoding circuit which comprises relatively few and simple electronic circuit elements and which is suitable for realization as a single large scale integrated circuit.
  • a tri-state encoding circuit in an electronic musical instrument which includes a player operable control means movable by the player and capable of assuming one of a plurality of control positions.
  • a first signal source produces a first signal of predetermined frequency and duty cycle at a first one of said control positions and a second signal at a second one of said control positions, said second signal bearing a predetermined phase relationship with respect to said first signal, and means are provided for_producing a predetermined signal level on said movable control means when moved to a third one of said control positions.
  • the movable means thereby carries a control signal whose frequency and phase relationships correspond to the position thereof relative to said control positions.
  • An output circuit means detects the signal on said movable control means and produces therefrom a digitally encoded output signal indicative of the position of the player operable control means.
  • a switch designated generally,10 is illustrated in circuit with the tri-state encoding circuit of the invention.
  • the switch 10 comprises a movable contact 12 which is movable between a pair of fixed contacts 14 and 16.
  • this-switch 10 is a key-operated switch of a keyboard type electronic musical instrument. It will be appreciated, however, that the invention is equally applicable to any control member or switch of such an electronic musical instrument which is capable of assuming one of three possible positions.
  • the switch 10 may, of course, assume one of three possible positions: the movable contact 12 in contact with the fixed contact 14; the movable contact 12 in contact with the fixed contact 16, and the movable contact 12 in some position between the fixed contacts 14 and 16.
  • the tri-state encoding circuit of the invention is arranged to provide a binary encoded signal output on output lines A and B thereof as viewed in Fig. 1.
  • a two-bit binary signal is capable of having four possible states, it will be recognized that encoding of three states may be readily accommodated by these two output lines A and B.
  • the switch contacts or terminals 14 and 16 are fed signals from a suitable source such as a clock 18.
  • these signals are readily available from a source such as clock 18 which is already part of the electronic musical instrument with which the invention is utilized. Accordingly, no additional or special provision need be made for deriving suitable signals (described later) to-be-utilized - throughout the circuit of the invention.
  • the signal at the contact or terminal 14 is designated ⁇ 1
  • the signal at terminal 16 is designated ⁇ 1
  • the signal ⁇ 1 is of a selected frequency and duty cycle
  • the signal 01 is 180° out of phase therewith.
  • the movable contact 12 will carry either the signal 0 1, the signal ⁇ 1 , or be in an open circuit (OC) condition, thus defining the three possible states of the switch 10.
  • a source of DC potential (B+) feeds a first gating element or FET 20.
  • This FET 20 has one terminal joined with a line 22 which is a control line received from the movable contact 12 of the switch 10.
  • this single line 22 carries the necessary signals from the key switch 10 of the keyboard-type electronic - musical instrument of the illustrated embodiment.
  • a common bus may be utilized to provide the same signals at the fixed contacts 14 and 16 of each such key switch or other similar three-state device of the instrument. Accordingly, a considerable savings in the time and labor associated with wiring is realized.
  • the DC control voltage B+ is fed to the gate electrode thereof while the source and drain electrodes are joined with the line 22 and with ground, respectively.
  • the line 22 also feeds respective electrodes of second and third gating elements or FET's.24 and 26. These FET's in turn feed the output lines A and B via respective inverter buffers 28 and 30.
  • These output lines A and B-. feed the logic signals developed thereat to a suitable utilization - circuit 31, which in the case of a percussion or piano simulation circuit generally takes the form of an envelope shaping and/or keying circuit.
  • the signal ⁇ 1 is also fed to the gate electrode of the FET 24 while the signal ⁇ 1 is fed to the gate electrode of the FET 26.
  • the FET's 24 and 26 have their respective source and drain electrodes connected to the line 22 and to the respective inverter buffers 28 and 30, respectively. Accordingly, control-signals developed on the-line 22 in response to the relative'position of movable contact 12 and to the action of the B+ signal via FET 20, are suitably gated through by the action of the control signals 0 1 and ⁇ 1 at FET's 24 and 26.
  • suitable binary encoded signals are respectively delivered by inverter buffers 28 and 30 to the output lines A and B.
  • Table 1 below illustrates the three possible positions of switch 10 and the corresponding logic signals developed at lines A and B in response thereto by the circuit of Fig. 1.
  • a change in the logic signals provided at output lines A and B is readily accommodated by making minor changes in the circuit of Fig. 1, as is illustrated by the circuit of Fig. 2.
  • the circuit is virtually identical with that of Fig. 1, whereby the same reference numerals are utilized, together with subscript a.
  • the embodiment of Fig. 2 includes a switch 10a comprising a movable contact 12 and a pair of fixed contacts 14a and 16a which receive the same signals ⁇ 1 and ⁇ 1 as the embodiment of Fig. 1.
  • a FET 20a receives the B+ DC control voltage at both the gate electrode and one of the source and drain electrodes thereof, the remaining electrode being fed to control line 22a.
  • the FET's 24a and 26a have their respective source and drain electrodes connected between control line 22a and respective inverter buffers 28a and 30a, which in turn feed the respective output lines A and B.
  • the signal ⁇ 1 is fed to the gate electrode of FET 24a while the signal ⁇ 1 is fed to the gate electrode of FET 26a. Accordingly, the logic signals developed at output lines A and B are as shown in Table 2.
  • the switch lOb comprises movable contact 12b and fixed contacts 14b and 16b which receive the respective signals ⁇ 1 and ⁇ 1 .
  • FET 20b is joined with the B+ DC control voltage and with the line 22b in the same fashion as illustrated and des- cribed for like elements 20a and 22a with reference to Fig. 2 above.
  • the gating elements or FET's 24b and 26b and the inverter buffers 28b and 30b have the same interconnectioias as the like elements 24a, 26a, 28a,_ and 30a, illustrated and described above with reference to Fig.
  • Respective inverter buffers 32b and 34b are interposed in the respective output lines A and B at the outputs of the inverter buffers 28b and 30b, respectively.
  • Each of these further inverter buffers 32b, 34b feeds one of the source or drain electrodes of a respective further gating element or FET 36b, 38b.
  • FET's 36b, 38b receive the control signals ⁇ 1 and ⁇ 1 at their gate electrodes and have their respective remaining electrodes (source or drain) tied to the respective inputs of inverter buffers 28b and 30b to complete their respective feedback loops.
  • the signal 1 feeds the gate electrode of FET 36b
  • control signal ⁇ 1 feeds the gate electrode of FET 38b.
  • FIG. 4 illustrates a further variation to.the circuits of the invention for avoiding such problems in maintaining proper clock phasing.
  • the components are all the same as described above with reference to the earlier Figs., therefore the same reference numerals are used throughout with the subscript c.
  • the circuit of Fig. 4 is identical with the circuit of Fig. 3, with the exception of the identity of the control signals feeding the gate electrodes of the FET's 24c, 26c, 36c and 38c.
  • these signals are as follows: a signal ⁇ 1 feeds the respective gate electrodes of FET's 26c and 36c, while a signal ⁇ 1 ' feeds the gate electrodes of FET's 24c and 38c.
  • the signal ⁇ 1 ' is a related duty cycle of the signal 1, while the signal ⁇ 1 ' is 180° out of phase with the signal ⁇ 1 '.
  • exemplary waveforms are illustrated for the respective control signals ⁇ 1 , ⁇ 1 , ⁇ 1 ' and ⁇ 1 ', as described above.
  • the signal ⁇ 1 may be on the order of 30 kilohertz at a 50% duty cycle, the signal ⁇ 1 being 180° out of phase therewith.
  • the signal ⁇ 1 ' is at the same frequency (30 kilohertz) at a 25% duty cycle, the signal ⁇ 1 ' being 180° out of phase therewith.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Nonlinear Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrophonic Musical Instruments (AREA)
EP80300437A 1979-05-10 1980-02-15 Drei-Zustands-Kodierungsschaltung für ein elektronisches Musikinstrument Withdrawn EP0019348A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US37687 1979-05-10
US06/037,687 US4207792A (en) 1979-05-10 1979-05-10 Tri-state encoding circuit for electronic musical instrument

Publications (1)

Publication Number Publication Date
EP0019348A1 true EP0019348A1 (de) 1980-11-26

Family

ID=21895731

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80300437A Withdrawn EP0019348A1 (de) 1979-05-10 1980-02-15 Drei-Zustands-Kodierungsschaltung für ein elektronisches Musikinstrument

Country Status (3)

Country Link
US (1) US4207792A (de)
EP (1) EP0019348A1 (de)
JP (1) JPS55151698A (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4299154A (en) * 1979-08-27 1981-11-10 Kimball International, Inc. Electronic rhythm generator
US4322996A (en) * 1980-04-16 1982-04-06 Norlin Industries, Inc. Alternating repeat keying signal generator
US4814638A (en) * 1987-06-08 1989-03-21 Grumman Aerospace Corporation High speed digital driver with selectable level shifter
TWI269529B (en) * 2005-06-14 2006-12-21 Richtek Technology Corp Tri-state output logic with zero quiescent current by one input control

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3048823A (en) * 1957-08-13 1962-08-07 Thompson Ramo Wooldridge Inc Transistor flip-flop indicator circuit
DE2237594A1 (de) * 1971-07-31 1973-02-15 Nippon Musical Instruments Mfg Elektronische musikinstrumente, die gespeicherte wellenformen zur tonerzeugung und -steuerung abtasten
US3819844A (en) * 1971-11-18 1974-06-25 Nippon Musical Instruments Mfg Electronic musical instrument keying system with envelope sample memorizing voltage dividers
FR2379198A1 (fr) * 1977-01-28 1978-08-25 Thomson Csf Horloge logique diphasee

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3969633A (en) * 1975-01-08 1976-07-13 Mostek Corporation Self-biased trinary input circuit for MOSFET integrated circuit
JPS52145A (en) * 1975-06-23 1977-01-05 Hitachi Ltd Tertiary value generator
JPS5284938A (en) * 1976-01-07 1977-07-14 Hitachi Ltd Logic circuit
US4010385A (en) * 1976-01-09 1977-03-01 Teletype Corporation Multiplexing circuitry for time sharing a common conductor
US4029971A (en) * 1976-02-13 1977-06-14 Rca Corporation Tri-state logic circuit
US4067253A (en) * 1976-04-02 1978-01-10 The Wurlitzer Company Electronic tone-generating system
JPS52146534A (en) * 1976-05-31 1977-12-06 Toshiba Corp Input circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3048823A (en) * 1957-08-13 1962-08-07 Thompson Ramo Wooldridge Inc Transistor flip-flop indicator circuit
DE2237594A1 (de) * 1971-07-31 1973-02-15 Nippon Musical Instruments Mfg Elektronische musikinstrumente, die gespeicherte wellenformen zur tonerzeugung und -steuerung abtasten
US3819844A (en) * 1971-11-18 1974-06-25 Nippon Musical Instruments Mfg Electronic musical instrument keying system with envelope sample memorizing voltage dividers
FR2379198A1 (fr) * 1977-01-28 1978-08-25 Thomson Csf Horloge logique diphasee

Also Published As

Publication number Publication date
JPS55151698A (en) 1980-11-26
US4207792A (en) 1980-06-17

Similar Documents

Publication Publication Date Title
CA1068948A (en) Electronic tone-generating system
US3786166A (en) Keyboard type electronic musical instrument
US4207792A (en) Tri-state encoding circuit for electronic musical instrument
EP0123222A2 (de) Digitalanalogwandler
JPS54134616A (en) Electronic musical instrument
US3651729A (en) Circuit for rapid note passage in electronic musical instrument
US4534257A (en) Electronic musical instrument
US3825667A (en) Alternate high-low and root-fifth selection system for electrical musical instruments
EP0024102A2 (de) Auf Berührung ansprechende Hüllkurvenregelung für elektronisches Musikinstrument
US3499092A (en) Accompaniment chord rhythm system
US3407260A (en) Electric organ polyphonic percussion system having multiple use keyers
CA1096665A (en) Digital arpeggio system
US4176575A (en) Improved touch operated capacitance switch circuit for an electronic organ
KR880004651A (ko) 반도체 집적회로
US4193038A (en) Key input apparatus
US4203337A (en) Large scale integrated circuit chip for an electronic organ
EP0039802A1 (de) Elektronisches Musikinstrument
US4117758A (en) Binary word debouncer
US4256002A (en) Large scale integrated circuit generator chip for electronic organ
EP0092360A3 (de) Elektronisches Musikinstrument
US4253366A (en) Large scale integrated circuit chip for an electronic organ
US4402247A (en) Integrated circuit generating keying envelope signals
KR890011076A (ko) 전화용 반도체 집적회로
JPS6137088Y2 (de)
GB2112197A (en) Providing touch response in electronic instruments

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT NL

17P Request for examination filed

Effective date: 19810112

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19820712

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HOSKINSON, WILLIAM ROBERT